processor.py

   1 import json
   2 import Queue as queue
   3 import socket
   4 import threading
   5 import time
   6 import traceback
   7 import sys
   8
   9 from utils import random_string, timestr, print_log
  10
  11
  12 class Shared:
  13
  14     def __init__(self, config):
  15         self.lock = threading.Lock()
  16         self._stopped = False
  17         self.config = config
  18
  19     def stop(self):
  20         print_log("Stopping Stratum")
  21         with self.lock:
  22             self._stopped = True
  23
  24     def stopped(self):
  25         with self.lock:
  26             return self._stopped
  27
  28
  29 class Processor(threading.Thread):
  30
  31     def __init__(self):
  32         threading.Thread.__init__(self)
  33         self.daemon = True
  34         self.dispatcher = None
  35         self.queue = queue.Queue()
  36
  37     def process(self, session, request):
  38         pass
  39
  40     def add_request(self, session, request):
  41         self.queue.put((session, request))
  42
  43     def push_response(self, session, response):
  44         #print "response", response
  45         self.dispatcher.request_dispatcher.push_response(session, response)
  46
  47     def run(self):
  48         while not self.shared.stopped():
  49             request, session = self.queue.get(10000000000)
  50             try:
  51                 self.process(request, session)
  52             except:
  53                 traceback.print_exc(file=sys.stdout)
  54
  55         print_log("processor terminating")
  56
  57
  58 class Dispatcher:
  59
  60     def __init__(self, config):
  61         self.shared = Shared(config)
  62         self.request_dispatcher = RequestDispatcher(self.shared)
  63         self.request_dispatcher.start()
  64         self.response_dispatcher = \
  65             ResponseDispatcher(self.shared, self.request_dispatcher)
  66         self.response_dispatcher.start()
  67
  68     def register(self, prefix, processor):
  69         processor.dispatcher = self
  70         processor.shared = self.shared
  71         processor.start()
  72         self.request_dispatcher.processors[prefix] = processor
  73
  74
  75 class RequestDispatcher(threading.Thread):
  76
  77     def __init__(self, shared):
  78         self.shared = shared
  79         threading.Thread.__init__(self)
  80         self.daemon = True
  81         self.request_queue = queue.Queue()
  82         self.response_queue = queue.Queue()
  83         self.lock = threading.Lock()
  84         self.idlock = threading.Lock()
  85         self.sessions = []
  86         self.processors = {}
  87
  88     def push_response(self, session, item):
  89         self.response_queue.put((session, item))
  90
  91     def pop_response(self):
  92         return self.response_queue.get()
  93
  94     def push_request(self, session, item):
  95         self.request_queue.put((session, item))
  96
  97     def pop_request(self):
  98         return self.request_queue.get()
  99
 100     def get_session_by_address(self, address):
 101         for x in self.sessions:
 102             if x.address == address:
 103                 return x
 104
 105     def run(self):
 106         if self.shared is None:
 107             raise TypeError("self.shared not set in Processor")
 108         while not self.shared.stopped():
 109             session, request = self.pop_request()
 110             try:
 111                 self.do_dispatch(session, request)
 112             except:
 113                 traceback.print_exc(file=sys.stdout)
 114
 115         self.stop()
 116
 117     def stop(self):
 118         pass
 119
 120     def do_dispatch(self, session, request):
 121         """ dispatch request to the relevant processor """
 122
 123         method = request['method']
 124         params = request.get('params', [])
 125         suffix = method.split('.')[-1]
 126
 127         if session is not None:
 128             if suffix == 'subscribe':
 129                 session.subscribe_to_service(method, params)
 130
 131         prefix = request['method'].split('.')[0]
 132         try:
 133             p = self.processors[prefix]
 134         except:
 135             print_log("error: no processor for", prefix)
 136             return
 137
 138         p.add_request(session, request)
 139
 140         if method in ['server.version']:
 141             session.version = params[0]
 142             try:
 143                 session.protocol_version = float(params[1])
 144             except:
 145                 pass
 146
 147
 148     def get_sessions(self):
 149         with self.lock:
 150             r = self.sessions[:]
 151         return r
 152
 153     def add_session(self, session):
 154         with self.lock:
 155             self.sessions.append(session)
 156
 157     def collect_garbage(self):
 158         # Deep copy entire sessions list and blank it
 159         # This is done to minimize lock contention
 160         with self.lock:
 161             sessions = self.sessions[:]
 162
 163         active_sessions = []
 164
 165         now = time.time()
 166         for session in sessions:
 167             if (now - session.time) > 1000:
 168                 session.stop()
 169
 170         bp = self.processors['blockchain']
 171
 172         for session in sessions:
 173             if not session.stopped():
 174                 # If session is still alive then re-add it back
 175                 # to our internal register
 176                 active_sessions.append(session)
 177             else:
 178                 session.stop_subscriptions(bp)
 179
 180         with self.lock:
 181             self.sessions = active_sessions[:]
 182
 183
 184
 185 class Session:
 186
 187     def __init__(self):
 188         self._stopped = False
 189         self.lock = threading.Lock()
 190         self.subscriptions = []
 191         self.address = ''
 192         self.name = ''
 193         self.version = 'unknown'
 194         self.protocol_version = 0.
 195         self.time = time.time()
 196         threading.Timer(2, self.info).start()
 197
 198
 199     # Debugging method. Doesn't need to be threadsafe.
 200     def info(self):
 201         for sub in self.subscriptions:
 202             #print sub
 203             method = sub[0]
 204             if method == 'blockchain.address.subscribe':
 205                 addr = sub[1]
 206                 break
 207         else:
 208             addr = None
 209
 210         if self.subscriptions:
 211             print_log("%4s" % self.name,
 212                       "%15s" % self.address,
 213                       "%35s" % addr,
 214                       "%3d" % len(self.subscriptions),
 215                       self.version)
 216
 217     def stopped(self):
 218         with self.lock:
 219             return self._stopped
 220
 221
 222     def subscribe_to_service(self, method, params):
 223         with self.lock:
 224             if (method, params) not in self.subscriptions:
 225                 self.subscriptions.append((method,params))
 226
 227
 228     def stop_subscriptions(self, bp):
 229         with self.lock:
 230             s = self.subscriptions[:]
 231
 232         for method, params in s:
 233             with bp.watch_lock:
 234                 if method == 'blockchain.numblocks.subscribe':
 235                     if self in bp.watch_blocks:
 236                         bp.watch_blocks.remove(self)
 237                 elif method == 'blockchain.headers.subscribe':
 238                     if self in bp.watch_headers:
 239                         bp.watch_headers.remove(self)
 240                 elif method == "blockchain.address.subscribe":
 241                     addr = params[0]
 242                     l = bp.watched_addresses.get(addr)
 243                     if not l:
 244                         continue
 245                     if self in l:
 246                         l.remove(self)
 247                     if l == []:
 248                         bp.watched_addresses.pop(addr)
 249
 250         with self.lock:
 251             self.subscriptions = []
 252
 253
 254 class ResponseDispatcher(threading.Thread):
 255
 256     def __init__(self, shared, request_dispatcher):
 257         self.shared = shared
 258         self.request_dispatcher = request_dispatcher
 259         threading.Thread.__init__(self)
 260         self.daemon = True
 261
 262     def run(self):
 263         while not self.shared.stopped():
 264             session, response = self.request_dispatcher.pop_response()
 265             session.send_response(response)